Roth DWT Installation Manual
4
Lubricating & Hydraulic Oil Storage and Dispensing
4. The secondary containment tank is made with 19 gauge galvanized steel. The use of steel
offers strength to resist damage to the inner tank from impacts by other objects, rigidity
to support the flexible inner tank, and the ability for electrical grounding of the tank where
required by local code. The outer tank sides and bottom are formed from one sheet of steel,
which is then shaped to receive the panels used at each end of the tank. The seams are
caulked and then rolled in a three step robotic procedure, producing a strong, fluid tight and
weld-free joint.
5. Each inner and outer tank is tested for defects and liquid tightness.
The inner tank is
pressure tested to 4.35psi
. It is also weighed to make sure it contains the correct amount
of material, and finally measured ultrasonically at critical points to verify that it has the
required wall thickness. Each sheet of steel for the outer tank is inspected for damage
or blemishes that could compromise the galvanized coating.
Once the outer tank is
assembled, it is pressure tested to .25 - .30psi
to ensure the integrity of its seams.
The
inner tank is then placed inside the outer tank, gaskets placed around the four openings of
the inner tank, and the outer tank top installed, riveted into place, and its edge rolled. The
leak detector, #3 gaskets, plastic and die-cast metal adaptors, cap nuts and dust plugs are
then installed, labels affixed, the warranty packet and tank base placed on top of the tank,
and finally a protective plastic shrink wrap is put over the top of the completed tank.
6. The completed tank has four connections at the top and, unlike a standard steel tank and
most other poly tanks, none elsewhere. By eliminating a connection below the oil level in
the tank, a potential source of leakage is eliminated. The four connections can be used
interchangeably, providing the installer with greater flexibility in accommodating difficult or
unusual piping installations.
Models and Specifications
Tank Model
DWT 400L
DWT 620L
DWT 1000L DWT 1000LH DWT 1500L
Nom. Capacity
US gal (liters)
110 (400)
165 (620)
275 (1000)
275 (1000)
400 (1500)
Length
inches (cm)
29 (74)
29 (74)
43 (110)
51 (130)
64 (163)
Width
inches (cm)
28 (72)
28 (72)
28 (72)
30 (76)
30 (76)
Height
inches (cm)
44 (112)
61 (155)
61 (155)
54 (137)
68 (173)
Min. Height Req’d
inches (cm)
49 (125)
66 (168)
66 (168)
60 (152)
76 (193)
Weight
lbs (kg)
106 (48)
132 (60)
167 (76)
208 (94)
333 (151)
Shipping Weight
lbs (kg)
115 (52)
143 (65)
185 (84)
230 (104)
358 (162)
